Drilling-machine.



No. 887,909. PATENTED'MAY 19, 1908.

B. F. BARNES.

DRILLING MACHINE. APPLICATION FILED EAR. 19, 1908.

3 SHEETS-$11331 1.

we'wavat R e/zip)? PATBNTED MAY 19, 1908.

B. F. BARNES.

DRILLING MACHINE.

APPLICATION FILED MAR. 19, 1906.

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BENJAMIN F. BARNES, OF ROCKFORD, ILLINOIS, ASSIGNOR TO B. F. BARNES COMPANY, OF ROCKFORD, ILLINOIS, A CORPORATION OF ILLINOIS.

DRILLING-MACHIN E Specification of Letters Patent.

Patented May 19, 1908.

To all whom it may concern:

Be it known that I, BENJAMIN F. BARNES, a citizen of the United States, residing at Rockford, in the county of Winnebago and State of Illinois, have invented certain new and useful Improvements in Drilling-Machines, of which the following is a specification.

One of the objects of this invention is to provide a positive feed for the drill spindle, so as to obviate the slip incident to belt and other non-positive drives.

Another object ofthe invention is the production of a spindle feed mechanism permitting of avery fine gradation-in the changes of feed speed.

The invention further refers to the details of construction in such a mechanism hereinafter shown and described.-

In the accompanying drawings, Figure 1 is a view showing in side elevation a drilling machine to which my improved feed mechanism has been attached. Fig. 2 is a similar view u on a scale somewhat larger than that of the ast preceding figure, showing the elements of said feeding device. Fig. 3 is a View showing said feeding device in front elevation. Fig. 4 is a longitudinal vertical section through the ratchet shaft of said feed. Fig. 5 is a topplan view of the ratchet mechanism. Fig. 6 is a top plan view of the means for locking the shifting lever.

The drill to which I have herein shown my feed mechanism as applied comprises a frame 1 of common form, which frame supports the usual drill spindle 2 and the horizontal power shaft 3. Upon the power shaft 3 is fixed a cone drive pulley 4. Bevel pinions 5 and 6 transmit power from the power shaft 3 to the drill spindle 2 for rotating the latter.

The mechanism for feeding the drill spin die 2 comprises a feed shaft 7 having the usual rack and pinion connection with said spindle. Upon one end of said feed shaft is fixed a worm-wheel 8. The drill is provided with a lever feed 9 and a hand-wheel feed 10, both of common construction, operatively connected with said spindle feed-shaft 7 for manually raising and lowering the drill spindle.

'The feed mechanism of this invention is herein shown as connected with the wormwheel 8 u on the feed shaft 7 by means of a worm 11 fixed upon the lower end of a shaft 12. Said shaft is rotatably supported in the vertical bearings 13 and 14 of a bracket 15, which bracket is pivotally mounted, by means of a hub 16 integral with said bracket, upon a fixed shaft 17 supported at one end by the cross-arm 18 of the drill frame and at its other end by a brace 19 extending to the feed shaft 7. In the bracket 15 are two horizon tal bearings 20 and 21, the latter bearing being supported from the up or hearing 14 by a curved arm 22. Within the horizontal bearings 20 and 21 is rotatably mounted a ratchet shaft 23 having fixed upon it two ratchet hubs 24 and 25, the inclined ratchet teeth being upon adjacent faces of said hubs and slanting in the same direction. The ratchet hub 24 is formed integral with a bevel pinion 26 the teeth of which mesh with those of a pinion 27 fixed to the upper end of the shaft 12.

Two spur pinions 28 and 29 are loosely mounted upon the ratchet shaft 23 between said hubs 24 and 25, which said pinions have upon their outer sides a series of ratchet teeth adapted to engage with the corresponding teeth of the adjacent ratchet hubs. A coiled spring 30 surrounds the ratchet shaft 23 with its ends lying in contact with the pinions 28 and 29, and said spring tends to hold the ratchet teeth of said pinions in engagement with the corresponding teeth of the ratchet hubs 24 and 25. Two rack bars 31 and 32 are adapted to engage with opposite sides of the inions 28 and 29, respectively, said rack ars being secured to a yoke 33, which yoke in turn has a pivotal connection with a sleeve 34, by means of ears 35 formed integral with said sleeve.

A lever 36 is pivotally mounted at a point between its ends upon an arm 37 of the bracket 15, and carries at its upper end a roller stud 38 adapted to lie in the cam groove 39 of a hub 40 fixed on the drive shaft 3. To the lower arm of the lever 36 is rigidly attached, by means of the ears 41, a guide rod 42 upon which the sleeve 34 is slidably mounted, said guide rod extending from the lower end of said lever 36 to a point upon the opposite side of the oscillatory center of said lever.

It will be seen that the length of the stroke of the rack bars 31 and 32 due to the oscillation of the lever 36 depends upon the position of the sleeve 34 with reference to the pivotal center of said lever. The means herein shown for shifting the position of said sleeve to vary the stroke of the rack bars 31 and 32 and thus to vary the feed speed comprises a T-lever 43 pivotally mounted, in this instance, u on the hub 16 of the bracket 15 by means 0 ears 44 on said hub. One arm of said T-lever is attached by means of a link 45 to the sleeve 34 and the 0 posite arm is pivotally connected with a shlfting lever 46. The shifting lever 46 extends forwardly to a point within easy reach of the operator. Various means may be used for locking the speed-changing mechanism in adjusted position. That herein shown comprises a headed locking stud 47 on the drill frame adapted to lie in any one of a plurality of notches 48 formed in the under side of the shifting lever 46. A guard rod 49 fixed to said shifting lever beneath the notched portion thereof, holds said lever in place upon the stud 47-.

As is usual in power-feed drills, the handfeeds and the power-feed are rendered severally inoperative when one or the other is in operative engagement with the spindle, that is to say, the throwing in of one of the hand-feeds automatically throws out the power-feed, and vice versa. In the present construction the handfeeds and the powerfeed likewise are made alternately inoperative, the latter by rocking the bracket 15 on its pivot bearing 17 to separate the gears 8 and 11, but as any of the common forms of throw-out mechanisms are adapted to accomplish this result, and as the throw-out mechanism is no part of this invention I have thought it unnecessary to illustrate or describe it.

In operation, the rotation of the power shaft 3 oscillates the lever 36 and reciprocates the rack bars 31 and 32. Upon the forward movement of said rack bars the rack bar 31 rotates the pinion 28, the clutch teeth upon the side of said pinion engage the simi lar teeth of the hub 25, and the shaft 23 is rotated, feeding the drill s indle downward. At the same time, the rack ar 32 rotates the pinion 29 in a direction opposite to the direction of rotation of the pinion 28, the ratchet teeth upon the side of said pinion 29 slipping over the teeth upon the side of the hub 24. Upon the rearward stroke of the rack bars 3 1 and 32 the pinion 29 is rotated to drive the ratchet shaft 23 and the pinion 28 turns idly on said shaft. The feed speed is regulated by operating the shifting lever 46 to move the sleeve 34 toward or away from the center of oscillation of the lever 36, such movement of the sleeve 34 changing the length of the stroke of the rack bars 31 and 32 and consequently altering the rate at which the drill spindle is lowered.

-When the sleeve 34 is close to the center of oscillation of the lever 36 the speed at which the drill spindle is fed is very slow, and when said sleeve is near the lower end of the lever 36 a rapid feed or the drill spindle is obtained. Between these extremes very fine gradations of the speed may be obtained by adjusting the osition of the sleeve 34.

T e spindle feed mechanism consists of the feed shaft 7, the rack bars 31 and 32, the connecting gearing, and the cam 40 and lever 36 for reciprocating said rack bars. It will thus be seen that the spindle feed is positive, and free from the slip unavoidably occur ring with a belt or friction drive.

I claim as my invention:

, 1. In a feed mechanism, in combination, a feed shaft; a shaft geared to said feed shaft; two pinions having a ratchet connection with said last mentioned shaft and arranged to drive said shaft in one direction; an oscillatory lever; means for oscillating said lever; two rack bars arranged to move together and to engage opposite sides of said pinions, said rack bars being pivotally connected with said oscillatory lever; and means for changing the point of pivotal connection between said rack bars and said oscillatory lever.

2. In a feed mechanism, in combination, a feed shaft; a shaft geared to said feed shaft; two ratchet hubs on said last mentioned shaft; two pinions on said last mentioned shaft, having ratchet teeth adapted to engage said ratchet hubs, said pinions being arranged to drive said shaft in one direction; a coiled spring lying between said pinions for holding them in clutch. with said hubs; two rack bars arranged to move together and to engage opposite sides of said pinions; an oscillatory lever, said rack bars being ivotally connected with said oscillatory ever; means for changing the point of pivotal connection between said rack bars and said oscillatory member; a power shaft; a grooved cam'on said shaft; and a cam roller on said oscillatory lever engaging said grooved cam.

3. A drilling machine comprising a drill spindle, and a positive feed for said spindle, said ositive feed comprising a gear train, two pmions having a ratchet connection with said gear train and arranged to drive said gear train in one direction, two rack bars one for each pinion, engaging opposite sides of said pinions, and a cam and connections for reciprocating said rack bars, said connections comprising means for adjusting the stroke of said rack bars.

4. In a drilling machine, in combination, a power shaft; a drill spindle; a gear connection between said shaft and said spindle for rotating the latter; a positive feed for said spindle comprising a gear train; two pinions having a ratchet connection with said gear train and arranged to drive said gear train in one direction; two rack bars one for each pinion, engaging opposite sides of said pinions; a cam on said power shaft; and a pivoted lever arranged to be oscillated by said cam and adjustably connected to said rack bars.

5. In a drilling machine, in combination, a

for yieldingly holding said pinions in clutch With said hubs; two rack bars arranged to move together and to engage opposite sides of said pinions; and means for reciprocating said rack bars.

' BENJAMIN F. BARNES. Witnesses:

L. L. MILLER, GEORGE L. OHINDAHL.

drill spindle; a feed shaft operatively con nected with said drill spindle; a vertical shaft geared to said feed shaft; a horizontal shaft geared to said vertical shaft; tWo ratchet hubs on said horizontal shaft; two pinions on said horizontal shaft having ratchet teeth adapted to engage said ratchet hubs, said pinions being arranged to drive said horizontal shaft in one direction; means I 

